English: White deposits of salts are sometimes found in the brickwork, known as efflorescence. Efflorescence is caused by the crystallization of water-soluble salts on the surface of brickwork. These deposits besides being unsightly may also damage the brickwork by disintegrating its surface or destroying individual bricks. Water finds access to brickwork, moves along the brick pores by capillary action and carries with it dissolved salts. As the solution evaporates from the exposed surface of the brickwork the salts are left as deposits on the surface or on layers just below it. Usually sulfates of magnesium, potassium, sodium, and calcium cause efflorescence. These salts may also be formed due to the effect of the atmosphere on limestones used in combination with bricks or by the inner action between brick and mortar. Contamination with sea water, either directly or through wind is another possible source.